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    dwdavis1's Avatar
    dwdavis1 Posts: 1, Reputation: 1
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    #1

    Oct 23, 2013, 02:47 PM
    Furnace drive size
    I am doing a furnace change out. The old furnace is a Mars the model number is H125 and the serial number is 56X257. It has 125,000 Btu input. I need to know what size ton drive this model would have. Any help on this would be greatly appreciated.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Oct 24, 2013, 01:40 PM
    What is a "drive size "? Never heard this term before. AC? If so, there is no particular BTU. You need to have a Manual J calculation done.
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